1 /*******************************************************************************
2 * Copyright (c) 2010, 2011 Association for Decentralized Information Management in
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.browsing.ui.model.children;
14 import java.util.Collection;
15 import java.util.Collections;
17 import org.simantics.browsing.ui.model.tests.Test;
18 import org.simantics.db.ReadGraph;
19 import org.simantics.db.exception.DatabaseException;
22 * A child rule that follows the given relation. Content type of both parent
23 * and child node types must be Resources.
24 * @author Hannu Niemistö
26 public class EqualContentChildRule implements ChildRule {
29 public EqualContentChildRule(Test condition) {
33 public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
34 if(condition != null && !condition.test(graph, parent))
35 return Collections.emptyList();
37 return Collections.singletonList(parent);
41 public Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException {
42 if(condition != null && !condition.test(graph, child))
43 return Collections.emptyList();
45 return Collections.singletonList(child);
49 public boolean isCompatible(Class<?> contentType) {
53 return condition.isCompatible(contentType);